John h



(No Model.)

. M J M M M W I; J... w ww W W b a a 4 HAHN ,4 M W J 4 w w Ti J w J m irnll. w, A w d w P E e e 7 6 J 5e! 10 w BM f 0 Z 0 0 5 0 J, 5 m y 3 5 7 0 N WASHINGTON NITED STATES PATENT OFFICE.

JOHN H. CLARK, OF BOSTON, MASSACHUSETTS, A SSIGNOR TO THE \VHITTIER MACHINE COMPANY, OF SAME PLACE.

ELEVATOR.

' SPECIFICATION forming part of Letters Patent No. 520,755, dated May 29, 1894.

Applicati n fi November 15, 1886. $erial No. 218,384. (No model.)

To all whom it may concern.-

Be it known that I, JOHN H. CLARK, of Boston, county of Sulfolk, and State of Massachusetts, have invented an Improvement in Elevators, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts. a

This invention has for its object to effect the starting and stopping of elevators, and more particularly that class known as passengerelevators, by means of pressure upon a piston, the latter controlling the operation of the motor mechanism employed to move the car.

The particular features in which my invention consists will be pointed out in the claims at the end of thisspecification.

Figure l in section and elevation shows an elevator and one form of motor mechanism embodying my invention, operated by pressure upon a piston controlled by the operator from within the car; Fig. 2 a sectional view of the cook or valve shown in Fig. 1 and for controlling the pressure upon the piston which controls the operation of the motor mechanlsm.

Referring to Fig. 1, the car A is shown as suspended in the hoist-way formed by the sides or walls a in a building or other structure, by a rope or cable a having one end fastened as at a, to the said car. The rope or cable a is passed about a sheave a near the top of the building and is extended down to near. the bottom of the hoistway, where it is passed about sheaves a a supported in guides a the said rope or cable having its end fastened to or near the sheave a. The sheave a is supported in stationary bearings while the shaft or bearing of the sheave a is movable, it traveling in the guide a". v The shaft of the sheave a is connected to the piston-rod b of a piston b reciprocating in'an operating cylinder 6 herein shown as located in the basement of the building. The cylinder b as herein shown communicates by a single passage or port 0 with a valve chest 0 provided with a valve 0 herein shown as an ordinary slide valve. The valve 0 is provided with a valve stem or rod 0 extended through the valve chest 0 and forming the piston rod of a piston c reciprocating in a controlling cylinder 0 supported as shown upon the cylinder The cylinder 0 on opposite sides of the piston c is provided with ports 0 herein shown in the ends of said cylinder. The port 0 is connected to one end of a pipe d herein shown as rigid and connected at its upper end with a flexible pipe d communicating with one port d see Fig. 2, of a valve herein shown as a four way cock or valve 61 located within the car A, the port 0 being connected by similar pipes 61 d with the port d opposite the port d in the said cook or valve. The cook or valve 61 is provided with two ports e, e at right angles to the ports d (1, the port 2 being connected by pipes e e with the pressure tank e containing water, air or other medium under pressure, the said Water or other medium being supplied to said tank through a pipe e by apump not herein shown. The port 6' is connected to the exhaust pipes e e which as herein shown lead to the outside of the building.

The communication of the ports in the fourway cock or valve is controlled by a valve plug f operated by a handle or lever f.

In the operation of the elevator as thus far described and shown in Fig. 1, the car is sup posed to have been stopped at the first floor D, the valve 0 being centered, that is with the passage 0 closed, the plug f occupying the position shown by full lines to close the inlet and exhaust ports e, e, the piston '0 at such time being at the center of its stroke with an equal pressure on each side. If it is desired to ascend, the operator will turn the handle f into the dotted line position marked 2,the pressure inlet porte then communicating with the port d while theexhaust port 6 is connected with the port at. With the valve in the last mentioned position pressure from the tank c passes through the pipes e 6 ports e and d in the valve, pipes d, d and port e into the controlling cylinder 0 moving the piston c in the direction of arrow 21. The movement of the piston c in the direction of arrow 21, opens the port 0 and admits pressure to the operating cylinder b to move the piston 12' in the direction of arrow 23, thus drawing the movable sheave a away from the fixed sheave a, and elevating the car.

As the piston c is moved in the direction of arrow 21, the water or other medium contained in the cylinder 0 on the left of the piston as shown in Fig. 1, is forced through port 0:, pipes d (1 ports cl, 6', and exhaust pipes e e If it is desired that the car should descend from the position shown in Fig. 1, the lever or handle f is turned into the dotted line position marked 3 placing the inlet port e in communication with the port d and the exhaust port e with the port (1 WVith the plug f in this position, water or other medium passes from the tank e, through pipes e e ports (2, d, and pipes at, (Z and port c into the controlling cylinder a, forcing the piston c in a direction opposite to thatindicated by arrow 21, thus moving the valve 0 toward the right to place the port 0 in communication with exhaust f thus permitting the car to descend by gravity. 7

If it is desired to stop at any point on the descent of the car, the lever f will be first moved to turn the plug f from the position marked 3 to that marked 2,to admit pressure into the operating cylinder 0 through the pipe (1, thereby moving the valve 0 in direction of arrow 21. When the valve 0 has been centered, which fact is made known by the stopping of the car, the leverf is turned to place the plugf in its full line position and thus close the pressure inlet and outlet, the car remaining stationary as long as the plug foccupies its full line position.

If it is desired to stop the car on its ascent, the valve 0 must be centered in like manner by moving the lever f in an opposite direction to that required when the ear is descendlng.

It will be seen that it is necessary to employ only four flexible pipes extending to the elevator car, two of which connect the valve with the opposite ends of the controlling cylinder, and the other two being, respectively, the inlet and discharge pipes.

It will be evident that any of the usual forms of valve operating engines may be substituted for that shown and that the elevator engine and its valve may be of any usual or approved construction.

Without limiting myself to the precise construction and arrangement of parts shown, I claim- 1. An elevator car, a motor mechanism to move the same, a cylinder, its piston and means actuated thereby to control the operation of the said motor mechanism, and a pressure tank combined with a controlling valve on and movable with the elevator car, a single pressure inlet pipeleading from the pressure'tank to said valve, independent flexible pipes connecting the valve directly with the opposite ends of said cylinder, and a single discharge pipe leading from the said valve, movement of the valve placing the single in let pipe in communication with one or the other of the two pipes leading to opposite ends of said cylinder to admit pressure thereto for moving the piston therein in one or another direction, the other of said pipes being by the same movement of the valve placed in communication with the single exhaust pipe, whereby a single inlet pipe, at single discharge pipe and two pipes connecting the valve with the controlling cylinder are employed, substantially as described.

2. The combination with the cage, engine, and controlling valve of an elevating apparatus, of a valve operating engine, and a valve device in the cage communicating through flexible pipes with a source of motor fluid supply and also with the valve operating engine, substantially as and for the purpose set forth.

3. The combination with the actuating engine and valve of an elevator apparatus, of an engine connected to operate said valve, a valve device upon the cage, and flexible pipes leading from a source of motor fluid supply to said valve device, and from the latter to the engine whereby the supply and discharge of fluid to and from said engine is through said valve device, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN H. CLARK.

Witnesses:

F. L. EMERY, J AS. ll. CHURCHILL. 

